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<!doctype html>

<html>

<head>

<title>Grid Tower</title>

tdl.require('tdl.buffers');

tdl.require('tdl.fast');

tdl.require('tdl.fps');

tdl.require('tdl.log');

tdl.require('tdl.math');

tdl.require('tdl.models');

tdl.require('tdl.primitives');

tdl.require('tdl.programs');

tdl.require('tdl.textures');

tdl.require('tdl.webgl');

window.onload = initialize;

// globals

var gl; // the gl context.

var canvas; // the canvas

var math; // the math lib.

var fast; // the fast math lib.

var g_eyeSpeed = 0.5;

var g_eyeHeight = 10;

var g_eyeRadius = 20;

var g_targetHeight = 8;

var g_cubeSize = 1;

var g_ringRadius = 3;

var g_gridWidth = 16;

var g_gridHeight = 16;

var g_numCubes = g_gridWidth / g_gridHeight;

function CreateApp() {

var updatePositions = true;

window.addEventListener('keypress', handleKeyPress, false);

function handleKeyPress(event) {

updatePositions = !updatePositions;

}

function resizeCanvas(canvas) {

if (canvas.width != canvas.clientWidth ||

canvas.height != canvas.clientHeight) {

canvas.width = canvas.clientWidth;

canvas.height = canvas.clientHeight;

//console.log("resized canvas: " + canvas.width + ", " + canvas.height);

gl.viewport(0, 0, canvas.clientWidth, canvas.clientHeight);

}

var randInt = function(range) {

return Math.floor(Math.random() * range);

}

// Create Geometry.

// Load textures

var textures = {

diffuseSampler: tdl.textures.loadTexture('../google-io/2011/assets/google.png')

};

var waterArrays = tdl.primitives.createPlane(80, 80, 1, 1);

// Move the water up 1 unit. (could do this at draw time but doing it here

// means no need to change the world matrix between drawing the cubes and drawing the ground.

tdl.primitives.reorient(

waterArrays,

[1, 0, 0, 0,

0, 1, 0, 0,

0, 0, 1, 0,

0, 1, 0, 1]);

var water = new tdl.models.Model(

tdl.programs.loadProgramFromScriptTags('waterVertexShader', 'waterFragmentShader'),

waterArrays,

{});

// Create Shader Program

var program = tdl.programs.loadProgramFromScriptTags(

'sphereVertexShader',

'sphereFragmentShader');

// -- Setup Instances ----------------------------------

var instances = [];

var arrayInstances = [];

for (var yy = 0; yy < g_gridHeight; ++yy) {

for (var xx = 0; xx < g_gridWidth; ++xx) {

instances.push({

colorMult: new Float32Array(g_glColors[math.randomInt(g_glColors.length)]),

column: xx,

row: yy,

flag: 1,

timeOffset: Math.random() * 40,

});

// make a cube

var cubeArrays = tdl.primitives.createCube(g_cubeSize);

// move it to the edge of a ring

var orientation = fast.matrix4.identity(new Float32Array(16));

fast.matrix4.rotateY(orientation, Math.PI * 2 * xx / g_gridWidth);

fast.matrix4.translate(orientation, [0, 0, g_ringRadius]);

tdl.primitives.reorient(cubeArrays, orientation);

// Add the other per vertex data.

var numElements = cubeArrays.position.numElements;

cubeArrays.flag = new tdl.primitives.AttribBuffer(1, numElements);

cubeArrays.columnRowTimeOffset = new tdl.primitives.AttribBuffer(3, numElements);

cubeArrays.colorMult = new tdl.primitives.AttribBuffer(4, numElements);

arrayInstances.push(cubeArrays);

}

// Expand arrays from instances to geometry.

var expanded = tdl.primitives.concatLarge(arrayInstances);

// Step 3: Make models from our expanded geometry.

var models = [];

for (var ii = 0; ii < expanded.arrays.length; ++ii) {

models.push(new tdl.models.Model(program, expanded.arrays[ii], textures));

}

// Step 4: Copy in the per vertex data.

for (var ii = 0; ii < instances.length; ++ii) {

var instance = instances[ii];

var info = expanded.instances[ii];

var index = info.arrayIndex;

instance.firstVertex = info.firstVertex;

instance.numVertices = info.numVertices;

instance.expandedArrayIndex = index;

var arrays = expanded.arrays[index];

arrays.colorMult.fillRange(

instance.firstVertex, instance.numVertices, instance.colorMult);

arrays.columnRowTimeOffset.fillRange(

instance.firstVertex, instance.numVertices,

[instance.column * Math.PI * 2 * 4 / g_gridWidth, instance.row, instance.timeOffset]);

arrays.flag.fillRange(

instance.firstVertex, instance.numVertices,

[instance.flag]);

}

for (var ii = 0; ii < models.length; ++ii) {

var arrays = expanded.arrays[index];

models[ii].setBuffer('colorMult', arrays.colorMult);

models[ii].setBuffer('columnRowTimeOffset', arrays.columnRowTimeOffset);

models[ii].setBuffer('flag', arrays.flag);

}

// pre-allocate a bunch of arrays

var projection = new Float32Array(16);

var view = new Float32Array(16);

var world = new Float32Array(16);

var worldInverse = new Float32Array(16);

var worldInverseTranspose = new Float32Array(16);

var viewProjection = new Float32Array(16);

var worldViewProjection = new Float32Array(16);

var viewInverse = new Float32Array(16);

var viewProjectionInverse = new Float32Array(16);

var eyePosition = new Float32Array(3);

var target = new Float32Array(3);

var up = new Float32Array([0,1,0]);

var lightWorldPos = new Float32Array(3);

var v3t0 = new Float32Array(3);

var v3t1 = new Float32Array(3);

var v3t2 = new Float32Array(3);

var v3t3 = new Float32Array(3);

var m4t0 = new Float32Array(16);

var m4t1 = new Float32Array(16);

var m4t2 = new Float32Array(16);

var m4t3 = new Float32Array(16);

var zero4 = new Float32Array(4);

var one4 = new Float32Array([1,1,1,1]);

// uniforms.

var sharedUniforms = {

viewInverse: viewInverse,

lightWorldPos: lightWorldPos,

specular: one4,

shininess: 50,

specularFactor: 0.2,

world: world,

worldViewProjection: worldViewProjection,

worldInverse: worldInverse,

worldInverseTranspose: worldInverseTranspose,

towerHeight: g_gridHeight,

rowOffset: 0,

time: 0,

};

var clock = 0.0;

var oldTopRow = g_gridHeight - 1;

var availableCubes = [];

var frameCount = 0;

var goup = 0;

var upOffset = 0;

var rowOffset = 0;

var waitTime = 0;

function update(elapsedTime) {

clock += elapsedTime;

++frameCount;

resizeCanvas(canvas);

if (goup) {

upOffset += elapsedTime;

if (upOffset >= 1) {

waitTime = 1;

upOffset = 0;

goup = 0;

rowOffset = (rowOffset + 1) % g_gridHeight;

}

sharedUniforms.rowOffset = rowOffset + upOffset;

}

sharedUniforms.time = clock;

// Make the camera rotate around the scene.

eyePosition[0] = Math.sin(clock * g_eyeSpeed) * g_eyeRadius;

eyePosition[1] = g_eyeHeight;

eyePosition[2] = Math.cos(clock * g_eyeSpeed) * g_eyeRadius;

target[1] = g_targetHeight;

// Pick a random cube to turn on or off

// pick from the top row

var topRow = g_gridHeight - rowOffset - 1;

// If a new row scrolled on...

if (topRow != oldTopRow) {

// Put the old top row

// Note: this should be optimized to do the entire row at

// once since all the cubes' flags for a single row are consecutive in memory

// but I'm lazy so I'm doing a cube at a time.

for (var ii = 0; ii < g_gridWidth; ++ii) {

var cubeId = oldTopRow * g_gridWidth + ii;

var instance = instances[cubeId];

var index = instance.expandedArrayIndex;

var attribBuffer = expanded.arrays[index].flag;

attribBuffer.fillRange(instance.firstVertex, instance.numVertices, [1]);

// Rely on the fact that we send all the flags to the GPU every frame below.

// Ideally we'd upload just the flags we set here.

}

// fill an array with choices of cubes to remove.

for (var ii = 0; ii < g_gridWidth; ++ii) {

availableCubes.push(ii);

}

oldTopRow = topRow;

}

// pick a cube in the top row and remove it.

if (Math.random() < 0.2 && availableCubes.length > 0) {

var inRow = randInt(availableCubes.length);

var cubeId = topRow * g_gridWidth + availableCubes[inRow];

availableCubes.splice(inRow, 1);

var instance = instances[cubeId];

var index = instance.expandedArrayIndex;

var attribBuffer = expanded.arrays[index].flag;

attribBuffer.fillRange(instance.firstVertex, instance.numVertices, [0]);

}

// If all the cubes in the top row are gone go up.

if (availableCubes.length == 0) {

goup = 1;

}

// Upload the changed data. Note: This calls gl.bufferData uploading the entire

// buffer. It could be optimized to upload only the tiny part changed.

for (var ii = 0; ii < models.length; ++ii) {

var attribBuffer = expanded.arrays[ii].flag;

models[ii].setBuffer('flag', attribBuffer);

}

// --Update Instance Positions---------------------------------------

//if (updatePositions) {

// var advance = elapsedTime / 2;

// for (var ii = 0; ii < instances.length; ++ii) {

// var instance = instances[ii];

// instance.xClock += advance * instance.xClockSpeed;

// instance.yClock += advance * instance.yClockSpeed;

// instance.zClock += advance * instance.zClockSpeed;

// var x = instance.x = Math.sin(instance.xClock) * instance.xRadius;

// var y = instance.y = Math.sin(instance.yClock) * instance.yRadius;

// var z = instance.z = Math.cos(instance.zClock) * instance.zRadius;

// var index = instance.expandedArrayIndex;

// var attribBuffer = expanded.arrays[index].worldPosition;

// attribBuffer.fillRange(instance.firstVertex, instance.numVertices, [x, y, z]);

// }

// for (var ii = 0; ii < models.length; ++ii) {

// var attribBuffer = expanded.arrays[ii].worldPosition;

// models[ii].setBuffer('worldPosition', attribBuffer);

// }

//}

}

function render() {

renderBegin();

renderScene();

renderEnd();

}

function renderBegin() {

var m4 = fast.matrix4;

// clear the screen.

gl.colorMask(true, true, true, true);

gl.depthMask(true);

gl.clearColor(1,1,1,0);

gl.clearDepth(1);

gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT | gl.STENCIL_BUFFER_BIT);

gl.enable(gl.CULL_FACE);

gl.enable(gl.DEPTH_TEST);

// Compute a projection and view matrices.

m4.perspective(

projection,

math.degToRad(60),

canvas.clientWidth / canvas.clientHeight,

5000);

m4.lookAt(

view,

eyePosition,

target,

up);

m4.mul(viewProjection, view, projection);

m4.inverse(viewInverse, view);

m4.inverse(viewProjectionInverse, viewProjection);

// Put the light near the camera

m4.getAxis(v3t0, viewInverse, 0); // x

m4.getAxis(v3t1, viewInverse, 1); // y

m4.getAxis(v3t2, viewInverse, 2); // z

fast.mulScalarVector(v3t0, 10, v3t0);

fast.mulScalarVector(v3t1, 10, v3t1);

fast.mulScalarVector(v3t2, 10, v3t2);

fast.addVector(lightWorldPos, eyePosition, v3t0);

fast.addVector(lightWorldPos, lightWorldPos, v3t1);

fast.addVector(lightWorldPos, lightWorldPos, v3t2);

// compute shared matrices

m4.translation(world, [0, 0, 0]);

m4.mul(worldViewProjection, world, viewProjection);

m4.inverse(worldInverse, world);

m4.transpose(worldInverseTranspose, worldInverse);

}

function renderScene() {

// -- Render Models ---------------------------------------

// We only need to render each model once

// as they contain all the instances.

for (var ii = 0; ii < models.length; ++ii) {

var model = models[ii];

model.drawPrep(sharedUniforms);

model.draw();

}

water.drawPrep(sharedUniforms);

water.draw()

; }

function renderEnd() {

// Set the alpha to 255.

gl.colorMask(false, false, false, true);

gl.clearColor(0,0,0,1);

gl.clear(gl.COLOR_BUFFER_BIT);

}

return {

update: update,

render: render

};

}

function initialize() {

math = tdl.math;

fast = tdl.fast;

canvas = document.getElementById("canvas");

var fpsTimer = new tdl.fps.FPSTimer();

var fpsElem = document.getElementById("fps");

gl = tdl.webgl.setupWebGL(canvas);

if (!gl) {

return false;

}

var app = CreateApp();

var then = (new Date()).getTime() * 0.001;

function render() {

requestAnimationFrame(render);

// Compute the elapsed time since the last rendered frame

// in seconds.

var now = (new Date()).getTime() * 0.001;

var elapsedTime = now - then;

then = now;

// Update the FPS timer.

fpsTimer.update(elapsedTime);

fpsElem.innerHTML = fpsTimer.averageFPS;

app.update(elapsedTime);

app.render();

}

render();

return true;

}

</script>

</head>

<body>

<div id="info"><span><a href="http://threedlibrary.googlecode.com" target="_blank">tdl.js</a> - grid tower</span></div>

</div>

</div>

</body>

uniform mat4 worldViewProjection;

uniform vec3 lightWorldPos;

uniform mat4 world;

uniform mat4 viewInverse;

uniform mat4 worldInverseTranspose;

uniform float rowOffset;

uniform float towerHeight; // This should probably be a const for speed

uniform float time;

attribute vec4 position;

attribute vec3 normal;

attribute vec2 texCoord;

attribute vec4 colorMult;

attribute vec3 columnRowTimeOffset;

attribute float flag;

varying vec4 v_position;

varying vec2 v_texCoord;

varying vec3 v_normal;

varying vec3 v_surfaceToLight;

varying vec3 v_surfaceToView;

varying vec4 v_colorMult;

const float kTimeRange = 40.0; // should be setable?

vec4 jiggle(vec4 position, float time) {

float timeOff = time * 3.14159 * 8.0;

float scale = sin(timeOff) * 0.1 + 1.0;

return vec4(position.xyz * scale, 1);

}

void main() {

// move the cube to the correct Y for this ring

float yOffset = mod(columnRowTimeOffset.y + rowOffset, towerHeight);

// Add in some up/down motion for this column

yOffset += sin(time * 4.0 + columnRowTimeOffset.x) * 0.15;

// If the time offset for this cube is in same range make it jiggle

// Note: Like the flag field you could set the timeRange on demand

// to make a particular cube jiggle at a specific time.

float localTime = mod(time - columnRowTimeOffset.z, kTimeRange);

vec4 pos = position;

if (localTime > 0.0 && localTime < 1.0) {

pos = jiggle(pos, localTime);

}

// Compute at world position but multiple by flag. I'm only using flag as 0 or 1

// but this is effectively a scale. 0 = invisible.

vec4 wp = (pos + vec4(0, yOffset, 0, 0)) * flag;

// Everything below here is a standard point light shader with a single texture.

v_texCoord = texCoord;

v_position = (worldViewProjection * wp);

v_normal = (worldInverseTranspose * vec4(normal, 0)).xyz;

v_colorMult = colorMult;

v_surfaceToLight = lightWorldPos - wp.xyz;

v_surfaceToView = (viewInverse[3] - wp).xyz;

gl_Position = v_position;

}

</script>

#ifdef GL_FRAGMENT_PRECISION_HIGH

precision highp float;

#else

precision mediump float;

#endif

varying vec4 v_position;

varying vec2 v_texCoord;

varying vec3 v_normal;

varying vec3 v_surfaceToLight;

varying vec3 v_surfaceToView;

varying vec4 v_colorMult;

uniform sampler2D diffuseSampler;

uniform vec4 specular;

uniform sampler2D bumpSampler;

uniform float shininess;

uniform float specularFactor;

vec4 lit(float l ,float h, float m) {

return vec4(1.0,

max(l, 0.0),

(l > 0.0) ? pow(max(0.0, h), m) : 0.0,

1.0);

}

void main() {

vec4 diffuse = texture2D(diffuseSampler, v_texCoord) * v_colorMult;

vec3 normal = normalize(v_normal);

vec3 surfaceToLight = normalize(v_surfaceToLight);

vec3 surfaceToView = normalize(v_surfaceToView);

vec3 halfVector = normalize(surfaceToLight + surfaceToView);

vec4 litR = lit(dot(normal, surfaceToLight),

dot(normal, halfVector), shininess);

gl_FragColor = vec4((

vec4(1,1,1,1) * (diffuse * litR.y

+ specular * litR.z * specularFactor)).rgb,

diffuse.a);

}

</script>

uniform mat4 worldViewProjection;

uniform vec3 lightWorldPos;

uniform mat4 world;

uniform mat4 viewInverse;

uniform mat4 worldInverseTranspose;

attribute vec4 position;

attribute vec3 normal;

attribute vec2 texCoord;

varying vec4 v_position;

varying vec2 v_texCoord;

varying vec3 v_normal;

varying vec3 v_surfaceToLight;

varying vec3 v_surfaceToView;

void main() {

v_texCoord = texCoord;

v_position = (worldViewProjection * position);

v_normal = (worldInverseTranspose * vec4(normal, 0)).xyz;

v_surfaceToLight = lightWorldPos - position.xyz;

v_surfaceToView = (viewInverse[3] - position).xyz;

gl_Position = v_position;

}

</script>

#ifdef GL_FRAGMENT_PRECISION_HIGH

precision highp float;

#else

precision mediump float;

#endif

varying vec4 v_position;

varying vec2 v_texCoord;

varying vec3 v_normal;

varying vec3 v_surfaceToLight;

varying vec3 v_surfaceToView;

uniform vec4 specular;

uniform float shininess;

uniform float specularFactor;

vec4 lit(float l ,float h, float m) {

return vec4(1.0,

max(l, 0.0),

(l > 0.0) ? pow(max(0.0, h), m) : 0.0,

1.0);

}

void main() {

vec4 diffuse = vec4(0,0,1,1);

vec3 normal = normalize(v_normal);

vec3 surfaceToLight = normalize(v_surfaceToLight);

vec3 surfaceToView = normalize(v_surfaceToView);

vec3 halfVector = normalize(surfaceToLight + surfaceToView);

vec4 litR = lit(dot(normal, surfaceToLight),

dot(normal, halfVector), shininess);

gl_FragColor = vec4((

vec4(1,1,1,1) * (diffuse * litR.y

+ specular * litR.z * specularFactor)).rgb,

diffuse.a);

}

</script>

</html>

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